Accelerated fat cell aging links oxidative stress and insulin resistance in adipocytes

Monickaraj, Finny and Aravind, S R and Nandhini, P and Prabu, P and Sathishkumar, C and Mohan, V and Balasubramanyam, M (2013) Accelerated fat cell aging links oxidative stress and insulin resistance in adipocytes. Journal of Biosciences, 38 (1). p. 113. ISSN 0250-5991



Telomere shortening is emerging as a biological indicator of accelerated aging and aging-related diseases including type 2 diabetes. While telomere length measurements were largely done in white blood cells, there is lack of studies on telomere length in relation to oxidative stress in target tissues affected in diabetes. Therefore, the aim of this study is to induct oxidative stress in adipocytes and to test whether these adipocytes exhibit shortened telomeres, senescence and functional impairment. 3T3-L1 adipocytes were subjected to oxidative stress and senescence induction by a variety of means for 2 weeks (exogenous application of H2O2, glucose oxidase, asymmetric dimethylarginine (ADMA) and glucose oscillations). Cells were probed for reactive oxygen species generation (ROS), DNA damage, mRNA and protein expression of senescent and pro-inflammatory markers, telomere length and glucose uptake. Compared to untreated cells, both ROS generation and DNA damage were significantly higher in cells subjected to oxidative stress and senescence. Adipocytes subjected to oxidative stress also showed shortened telomeres and increased mRNA and protein expression of p53, p21, TNFα and IL-6. Senescent cells were also characterized by decreased levels of adiponectin and impaired glucose uptake. Briefly, adipocytes under oxidative stress exhibited increased ROS generation, DNA damage, shortened telomeres and switched to senescent/pro-inflammatory phenotype with impaired glucose uptake.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Telomere shortening;biological indicator;type 2 diabetes
Subjects:Biochemistry,Cell and Molecular Signalling
Divisions:Department of Cell and Molecular Biology
Department of Diabetology
ID Code:655
Deposited On:01 Mar 2013 08:55
Last Modified:01 Mar 2013 08:55

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